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Method for treating cadmium-containing wastewater by using calcium carbonate and method for recycling cadmium ions

A technology of treatment method and recycling method, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as complex components, and achieve good effect of cadmium removal

Active Publication Date: 2022-01-07
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chemical methods are suitable for treating large-scale high-concentration cadmium-containing wastewater; physical and chemical methods (such as ion exchange and membrane separation methods) can realize resource recycling while treating heavy metal cadmium-containing wastewater; biological methods have the advantage of being green and pollution-free. However, its components are complex, and most of them are in the stage of research and promotion

Method used

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  • Method for treating cadmium-containing wastewater by using calcium carbonate and method for recycling cadmium ions
  • Method for treating cadmium-containing wastewater by using calcium carbonate and method for recycling cadmium ions
  • Method for treating cadmium-containing wastewater by using calcium carbonate and method for recycling cadmium ions

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Embodiment 1

[0049] CD formulated by 1000mg / L 2+ Solution, the added dose is 2 g / L amorphous calcium carbonate (specific surface area is 5.52m 2 / g), at room temperature for 2 days, taking a cadmium-containing solution after 5 ml of treatment, filtered through 0.22 μm syringe filter, the clarification solution was detected by an inductive coupling plasma emission spectrometer (ICP-OES), and the concentration of cadmium ions in the liquid was 0.866. Mg / L, remove CD 2+ The efficiency can reach 99.9% or more.

[0050] Continue to add amorphous calcium carbonate to make CD in the remaining solution 2+ The concentration is less than 0.05 mg / L.

Embodiment 2

[0052] Example 2 Difference with Example 1 is that in Example 2, the calcium carbonate (specific surface area is 11.26m) using the second embodiment. 2 / g). The cleaved liquid obtained after treatment was detected by an inductive coupling plasma emission spectrometer (ICP-OES), and the concentration of cadmium ions in the liquid was 0.824 mg / L, removing CD 2+ The efficiency can reach 99.9% or more.

[0053] Continue to join the calcium carbonate, so that the remaining solution is CD 2+ The concentration is less than 0.05 mg / L.

Embodiment 3

[0055] Formulated 10mg / L CD 2+ Solution, the added dose is 1.0 g / L amorphous calcium carbonate (specific surface area is 5.52m 2 / g), reactive for 20 minutes, taking a cadmium-containing solution after 5 ml of treatment, filtered through 0.22 μm syringe filter, clear liquid delivery inductive coupling plasma emission spectrometer (ICP-OES), the concentration of cadmium ions in the liquid is 0.031mg / L, remove CD 2+ The efficiency is 99.69%. CD in the remaining solution 2+ The concentration is less than 0.05 mg / L. Lower than "lead, zinc industrial pollutant emission standard" (GB25466-2010) limit 0.05 mg / L and "electroplating pollutant emission standard" (GB21900-2008) limit 0.05 mg / L.

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Abstract

The invention discloses a method for treating cadmium-containing wastewater by using calcium carbonate and a method for recycling cadmium ions. The method for treating the cadmium-containing wastewater comprises the following steps of mixing the cadmium-containing wastewater with calcium carbonate for reaction to obtain a cadmium-calcium mixed precipitate, thereby removing the cadmium ions in the cadmium-containing wastewater. By adopting the treatment method of the cadmium-containing wastewater and the method for recycling cadmium ions, the cadmium ions in the cadmium-containing wastewater can be converted into a small amount of high-concentration cadmium liquid, so that the treatment of the cadmium-containing wastewater and the recovery of cadmium are realized; and calcium carbonate which is not reacted completely can be continuously added into new cadmium-containing waste liquid to remove cadmium ions. The method provided by the invention has the advantages of simple operation, low cost, convenience in cadmium element recycling and the like.

Description

Technical field [0001] The present invention belongs to the field of chemical water treatment technology and, in particular, calcium recovery methods of processing waste water containing cadmium and cadmium ions is directed to a use. Background technique [0002] Cadmium is not essential element, which are highly toxic, carcinogenic belonging to class Ⅰ, on the human body after the elements mercury and lead, heavy metals national cap (Pb, Hg, Cr, Cd and metal As) one, also belongs to one of 13 kinds of "first type of contaminant." In "Lead, zinc industrial pollutants emission standards" (GB25466-2010) and "electroplating emissions standards" (GB21900-2008) provides new enterprises plant or production facility waste discharging port limit of 0.05mg / L; "integrated wastewater discharge standard" (GB 897-1996) stipulates that total Cd emission limit of 0.1mg / L; "drinking water health standards" provisions (GB 5749-2006), Cd emission limit of 0.005mg / L. Therefore, the cadmium-co...

Claims

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Application Information

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IPC IPC(8): C02F1/52C01G11/00C02F101/20
CPCC02F1/5236C01G11/00C02F2101/20C01P2002/72
Inventor 吴智诚林璋
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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